Overview
The southeastern United States — from the Carolinas through Florida and west to Texas — has remarkable plant diversity. That richness extends to toxic species. Being able to recognize which plants are dangerous and why is essential knowledge for hikers, parents, gardeners, and anyone spending time outdoors across the region.
This guide focuses on the most commonly encountered toxic plants — not rare exotics, but the plants you're likely to brush against on a trail, find in your backyard, or encounter along a riverbank. Recognizing them on sight is the first step to staying safe.
Key Species to Know
Poison Ivy
Toxicodendron radicans
"Leaves of three, let it be." A vine or shrub with three leaflets, glossy when young, with notched or toothed edges. White berries in fall. All parts contain urushiol oil, causing severe contact dermatitis.
Pokeweed
Phytolacca americana
A large native perennial, up to 10 feet tall, with magenta stems, large smooth leaves, and clusters of dark purple berries. Common in disturbed areas throughout the Southeast.
Water Hemlock
Cicuta maculata
One of North America's most violently toxic plants. Resembles edible wild parsnip and water parsley. Hollow chambered rootstock smells of parsnip. Causes violent convulsions and death.
Jimsonweed (Devil's Trumpet)
Datura stramonium
A rank-smelling annual with large white or purple trumpet-shaped flowers and spiny seed pods. Contains potent tropane alkaloids (atropine, scopolamine) that cause hallucinations, delirium, and death.
Wild Parsnip
Pastinaca sativa
An invasive plant with flat-topped yellow flower clusters. The sap causes severe phototoxic burns — skin exposure followed by sunlight causes blistering burns that can leave permanent scars.
Seasonal Guide
- Spring: Learn to spot poison ivy's three glossy leaflets before leaves are fully out.
- Summer: Wild parsnip burns are most common when the plant is flowering — wear long sleeves near roadsides.
- Fall: Pokeweed berries attract birds; keep children away from the tempting dark berries.
- Year-round: Water hemlock is dangerous in all seasons in wet areas.
Safety Reminder
If you believe someone has been poisoned by a plant, call Poison Control immediately: 1-800-222-1222 (US). Bring a photo or sample of the plant to the emergency room. The Spotter app can help identify suspect plants quickly.
Identify it instantly
Found something and not sure what it is? Point your camera with Spotter and get a species identification in seconds — with detailed reference info and species notes.